Inspect the pop-up camper's surfaces to determine if they are made of cotton, polyester, vinyl or acrylic. Look for holes or tears in the canvas. If there are rips, consider using a canvas repair kit to patch the surface. Mice only need an opening the size of a dime to squeeze through.
Insert bronze wool in or apply mailing tape to openings to close them against mice entry. Make sure to close off any plumbing openings and electrical locations.
Use aromatic deterrents. Mothballs, dryer sheets or cedar blocks may provide some protection against mice. The smell keeps rodents away from stored objects such as clothing and fabric. Mice also are known to avoid natural aromatic sources such as peppermint plants, bay leaves and hot pepper. Using natural deterrents is often suggested because chemicals and solutions can prove harmful to humans during prolonged exposure.
Use mouse traps around the pop-up. Mouse traps help to ensure the rodents heading toward the pop-up will be caught before they are close to entering. Avoid the use of poison in the camper as it could remain and its particles inhaled by future occupants.
Place ultrasonic pest control devices around the pop-up camper to provide auditory stress. The sound waves will prevent mice from seeking refuge not only in the camper but in a home or storage unit where the camper is kept.
Remove all food and garbage from camper. Mice are attracted to food of all kinds and even the smallest amount of discarded garbage could bring them in. When storing the pop-up camper, make sure it is completely clean and void of any wrappers, crumbs, dropped food and liquid spills.